(MAINT) Add authorized account for live branch targeting

[michaeltlombardi]

PR Summary

Prior to this change, the GHA workflow for checking authorization on submitting PRs to the live branch didn't include the authorized_accounts parameter.

When you retrieve the permissions for the learn-build-service-prod[bot] account, the API reports that the automation account lacks all permissions.

This change adds the bot account to an allow-list to prevent the error.

PR Checklist

• Descriptive Title: This PR's title is a synopsis of the changes it proposes.
• Summary: This PR's summary describes the scope and intent of the change.
• Contributor's Guide: I have read the contributors guide.
• Style: This PR adheres to the style guide.

[learn-build-service-prod]

PoliCheck Scan Report

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[learn-build-service-prod]

Learn Build status updates of commit 39147af:

✅ Validation status: passed

File	Status	Preview URL	Details
.github/workflows/targeting-valid-branch.yml	✅Succeeded

For more details, please refer to the build report.

[Copilot]

Pull request overview

This PR adds the learn-build-service-prod[bot] account to an allow-list in the GitHub Actions workflow that checks authorization for PRs targeting the live branch. The bot account's permissions cannot be properly validated through the GitHub API, so it needs to be explicitly authorized.

Changes:

• Added authorized_accounts parameter to the authorization action in the targeting-valid-branch.yml workflow

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